Oil burning heating unit



Oct 26, 1943, R, MARTl N 2,332,736

OIL BURNING HEATING UNIT Filed Sept. 2, 1941 3 Sheets-Sheet 1 33 Z5 7mg. 2. 3/ 7 22g 6 35 /o Z2 4? 2 A? 4! J 66 a 8 57 6 30 6 a? 52 IINVENTOR 7 ,3 2 4 w B0536 Mar-flit.

A'r'ro'RNEY ct. 26, 1943. R, MARTIN 2,332,736

I OIL BURNING HEATING UNIT Filed Sept. 2, 1941 3 Sheets-Sheet 2 la /aENTQ fl Mari/'1 ATTOFQNEY Patented Oct. 26, 1943 OIL BURNING HEATINGUNIT Russell Martin, Wichita,

Coleman Lamp and Stove Company,

Kans., assignor to The Wichita,

Kans., a corporation of Kansas Application September 2, 1941, Serial No.409,223

11 Claims.

This invention relates to air circulating type heating units,particularly thos burning fluid fuels, and has for its principal objectsto provide a unitary structure of low production cost .and having arelatively small cross-sectional area to conserve air circulating spaceand having a relatively large heat transferring surface for securinghigh efficiency; to provide a simplified heating unit consisting of twodrawn metal shells which, when assembled with a partition member,provide two separate chambers, one for combustion and the other of amplesize and shape to contain a conventional round pot-type burner and anair intake governor of the type which controls, by differentialpressures in the respective chambers, the flow of combustion supportingair to the burner chamber; and to provide a structure which facilitatesmaking an inexpensive connection from the low pressure side of the airgovernor to the combustion chamber.

Other objects of the invention are to provide a combustion chamber ofsuch construction and shape asto reduce expansion and contractionnoises; and to provide a combustion chamber with a service door which isconveniently opened and closed in the limited space provided between thetop of the combustion chamber and the top of the enclosing casing.

In accomplishing these and other objects of the invention, I haveprovided improved details of structure, the preferred form of which isi1- lustrated in the accompanying drawings, wherein:

Fig. 1 is a vertical section through a floor furnace equipped with aheating unit embodying the features of the present invention.

Fig. 2 is a plan view of the heating unit showing a part of the topbroken away to show the interior.

Fig. 3 is a. perspective view of the part composing the heating unitstructure showing the metal shells in spaced relation and ready to beassembled. v

Fig. 4 is a fragmentary section through a portion of the combustionchamber unit on the line 4-4 of Fig. 2.

Fig. 5 is a fragmentary section showing theformed ledge for supportingthe partition which carries the burner and forms the bottom of thecombustion chamber and the top of the burner chamber.

Fig. 6 is a vertical section through the lower portion of the heatingunit, particularly illustrating the air governor.

Fig. 7 is a horizontal section taken through the lower portion of theheating unit on the line 1-1 of Fig. 1.

Fig. 8 is a cross-section through the air intake governor on theline 8-8of Fi 6.

Referring more in detail to the drawings:

While a heating unit constructed in accordance with the presentinvention is adaptable to various types of heating devices, I haveillus- 'trated and described it in connection with a floor furnaceincluding an outer casing l adapted for suspension through a flooropening 2 and having its top covered by a grill 3. Supported in theouter casing is an inner casing 4 cooperating with vertical walls of theouter casing to form downdraft passageways 5 wherethrough air movesdownwardly from the marginal portions of the grill and upwardly aroundthe heater or combustion chamber unit 6 which is supported within theinner casing as shown in Fig. 1. The air, upon travelling upwardly alongth sides of the heating unit, is heated and discharged into the roomthrough the central portion of the grill as in conventional floorfurnace construction. v

With the exception of the heating unit 6, the above structure forms nopart of the present invention but is illustrated for the purpose of showing an adaptation o'fmy improved unit, it being understood that theunitis as readily adapted to radiant and circulating heaters and otherheating devices.

The heating unit is designed for simplicity and economy of manufactureand therefore includes a minimum of parts which are particularly adaptedto be constructed of sheet metal plates ressed into the desired shape.The unit includes a shell-like body composed of a pair of half shells 'land 8, as shown in Fig. 3, of similar construction and preferably formedby the same dies. Each half shell is of pan-like shape and ofsubstantially rectangular construction having a wall provided with anintegrally formed laterally extending perimetrical flange ll) of a widthto form one-half the fore and aft depth of the heating unit. Thejunctures of the flange 10 are formed on smoothly rounding curves II, asshown in Fig. 4. The flange l0 constitutes a top portion l2, sides [3and I4 and a bottom 15, which in-turn are provided with an outwardlyextending rim-like flange [6 whereby the respective half shells areconnected together as later described. The top portion l2 of each halfshell is provided with an elongated, notch-like opening ll defined by aninwardly extending flange l8 which cooperates with a door frame l9 toform an upwardly opening channel-like groove 20 to receive a gasket 2|against which a door 22 seats, as later described.

In order that the body of the heating unit may be relatively narrow inone direction to con-- serve air circulating space and at the same timeaccommodate a fire-pot of sufficiently large diameter, the walls 9 areeach provided with a central offset 23 projecting outwardly andextending from the top of the combustion chamber to a point near thebottom of the burner chamber. The ends of the offset are closed byinclined portions 25 merging into the top and bottom flange portions l2and l respectively, as clearly shown in Fig. 1. 4

Extending transversely of the wall 9, and across the side portions I3and I4 is a rib 26 constituting a ledge 21 for locating a partitionmember 28, later described. The rib is interrupted between one side ofthe offset 23 and the adjacent side flange, for example l4, to leavespace for the formation of a flue opening 29, part of which is locatedbelow the ledge 21 for a purpose later described. The partition member28 is also formed as a stamping of pan-like shape having a bottom 39shaped in Conformity with the horizontal cross-section of the assembledhalf shells to divide them into an upper combustion chamber proper 3|and a lower burner chambe 32. The partition therefore is provided withoffsets 33 and 34 adapted to fit within the offsets 23 as shown in Fig.3. The partition member includes an upwardly extending marginal flange35, cut away adjacent the flue opening. Aligning with the flue openingis a trough member having a lip 36 of arcuate cross-section and which isadapted to project through the lower portion of the flue opening 29 whenthe partition member is seated upon the ledge 27. The trough member 1also provides a depressed portion 31 in the combustion chamber bottom30, the end of which, opposite the lip, is closed by a Wall portion 38,having an opening 39 therethrough for a purpose later described. Thebottom 30 of the partition member is provided approximately in thecenter thereof with a circular opening 40 of a size to accommodate aburner or fire-pot 4!, best shown in Figs. 1, 2 and 6. It is obviousthat great economy in production is thus provided as only two mainforming dies are required to pro-' duce with low cost the three parts,which can be assembled with a minimum of labor cost into a unitarystructure including the spacious combustion chamber and a burner chamberof ample size to accommodate a burner of the pot-type illustrated andalso a suitable air intake governor,'late r described.

The pot 4| includes a cylindrical body 42, having a plurality of airinlet openings 43 whereby air is admitted from the burner chamber 32 tosupport combustion of the fuel admitted into a eoncaved bottom 44 of theburner pot by way of a fitting 45 extending through a suitable opening46 in the stamping 1 and having connection with a supply pipe 41,Fig. 1. The upper rim of the burner pot has a laterally extendingannular flange 48 which seats upon the partition member 28. The burnerpot further includes a low flame ring 49 suitably supported by the wallof the pot and an upper high fire ring 50 that is seated upon the flange48.

Formed in the flange portion of the wall 9 for the stamping 8 is anopening 5| located in lateral alignment with the depressed portion 3! ofthe partition member to accommodate an air intake governor 52 which isillustrated and described in detail in my copending application SerialNo. 407, 56, .filed August 16, 1941. Briefly, the governor includes acylindrical body '53 snugly engaged with the opening 5! and havingslotlike openings 54 wherethrough air is admitted into the burnerchamber responsive to pressure differential between the burner chamber32 and the pressure in the combustion chamber 3|, the air intakegovernor having an actuating vane 55' subject to this pressuredifferential by connection through a neck 57 projecting through theopening 39, previously referred to and through slots 54. The actuatingvane 55' effects throttling of the opening 56 by controlling a damper55.

In assembling the combustion chamber unit, a flue outlet collar 58 isspot welded in the flue opening 29 of the half shell 1. The door frameI9 is then spot welded to the flange portion l8 of the half shell 1. Theburner pot assembly is then passed' through the opening 40 and theflange thereof spot welded to the partition member 28. The trough memberhaving the lip 36 is spot Welded to the partition member. The partitionmember 28 is then inserted within the half shell 8 so that it seats uponthe ledge 21 thereof and is spot welded in position as indicated at 59,Fig. 5. The half shells 1 and 8 are then placed toge'therwith theflanges thereof in abutting relation, after which the flanges areinterconnected preferably by spot or seam welding as indicated at so.The door frame is then fastened to the half shell 8 by use of a portableclamp type resistance welder, one arm being positioned inside thecombustion chamber and the other on the outside, the door opening beingshaped to accommodate this type of equipment. The remaining unweldedhalf of the partition member flange is then welded to the contactingportions of the half shell I. This is effected by telescoping thecombustion chamber over one arm of a conventional spot Welder, the armextending through the door opening [1. The air intake governor 52 maythen be inserted through the opening 51 with the neck 51 thereofextending through the opening 39 and suitably secured in position. Thedoor 22 is hinged over the opening l'!. The door and hinging thereofalso form a part of the present invention, as now to be described.

The door is of a shape to cover the door open ing and has a perimetricalflange 6|. In order to hinge the door so that it may be moved to andfrom covering relation with the opening without exposing the under sidethereof and. to permit opened by lifting on the handle 68 to raise the.

door from the opening with the arms 62 pivoting within the ears 64 and65 and the door trunnioning upon the terminals. The door is thus swungretractively while being maintained par allel to the plane of the top ofthe combustion chamber. With this construction the door is opened withinthe limited vertical space and the outer side of the door always facesupwardly and the inner or lower portion ofthe door remains facedownwardly, eliminating the usual exposure of a sooty surface. Thisconstruction also permits the hinged door to swing completely away fromthe opening for cleaning purposes.

From the foregoing it is obvious that I have provided a heating unitwhich is capable of being manufactured at a minimum cost and wherein theparts are readily assembled and secured together, further reducing costof construction. It is obvious that the ofisets formed in the relativelylarge front and rear walls of the combustion chamber provide therequired space for the burner with a minimum cross-sectional area of thechambers, thereby conserving the required space for warm air circulationexteriorly of the chambers and sufficient curves are provided to takecare of expansion and contraction, and prevent booming noises incidentalto springing of the chamber sides in and out of their normal planes.

It is obvious that the partition member cooperates to form a'burnerchamber which encloses both the burner pot and air intake governor. Thepressure therein with respect to the pressure in the combustion chamberis maintained at the desired differential to cause combustion supportingair to flow through the fire-pot in desired quantity to maintainefficient combustion of the fuel as set forth in copending applicationpreviously referred to.

i What I claim and desire to secure Patent is: I

1.,A heating unit including, a shell, a partition member locatedintermediate the height thereof and dividing said shell into an uppercombustion chamber and a lower burner chamber, a burner in the burnerchamber and supported by said partition, and an air intake governorsupported in the burner chamber having connections with both chambersand subject to variation of pressure differential of the chambersthrough said connections for controlling admission of air to the burnerchamber when the heating unit is in operation.

2. A heating unit including, mating sections to form a shell havingledge portions'formed intermediate the length thereof, a partitionmember located on said ledge portions and dividing said shell into anupper combustion chamber and a lower burner chamber, a burner in theburner chamber and attached to said partition, and an air intakegovernor communicating with the burner chamber and the combustionchamber and subject to pressures therein for controlling admission ofair to the burner chamber.

3. A heating unit including, a shell; a partition dividing the shellinto a combustion chamber and a burner chamber, said partition having arecessed portion extending into the burner chamber and provided with anopening therethrough, a burner supported in the burner chamber, and anair intake governor supported in the burner chamher and having aconnection with the combustion chamber through the opening in therecessed portion and provided with an air inlet from out-.- side theburner chamber and an air outlet into the burner chamber,

4. A heating unit including, mating sections to form a shell, apartition member supported by said sections and dividing the shell intoan upper combustion chamber and a lower burner chamber, a burner in theburner chamber and communicating with the combustion chamber throughsaid partition, and an air intake governor supby Letters ported in theburner chamber and having connection with the combustion and burnerchambers for controlling admission of air to the burner chamber.

5. A heating unit including a shell, a partition dividing the shell intoa combustion chamber and a burner chamber, said partition. having arecess formed by an offset of said partition into the burner chamber andprovided with an opening in said oiiset, a burner supported in theburner chamber, and an air intakegovernor seated in said recess of theburner chamber and having a neck-like connection extending through saidopening to connect with the combustion chamber, said air intake governorbeing provided with an outside air inlet and an'air outlet supplying airto the burner chamber.

6. A heating unit including, mating sections of pan-like shape andhaving interconnected flange portions to form an enclosed shell, saidpan-like sections having enlarged central portions to accommodate aburner pot of substantially large diameter a partition supported in theshell and having offsets extending into the enlarged portions of thepan-like sections to divide the shell into an upper combustion chamberand a lower burner chamber, one of said pan-like sections having anopening extending through a side wall-thereof, and an air intakegovernor supported in said opening and extending into the burner chamberand having connection with the combustion chamber.

'7. A heating unit including, a shell, a partition within said shelldividing the shell into a combustion chamber and a burner chamber, aburner pot carried by the partition, an air intake governor connectedwith the burner chamber for admitting air to the burner chamber, and aconnection between the combustion chamber and the governor to subjectthe governor to combustion chamber pressure when the heating unit is inoperation.

8. A heating unit including, symmetrical panlike mating sectionsarranged vertically and having outwardly projecting portionsintermediate the width of said sections and extending vertically thereofto accommodate a liquid fuel burner pot within said sections, and apartition for supporting the burner pot and having portions'extendinginto said projecting portions to close the burner chamber from thecombustion chamber, said pan-like sections being secured together aroundmarginal edges thereof.

9. A heating unit including, symmetrical panlike mating sections, eachhaving a wall portion and an integrally formed laterally extendingperimetrical flange terminating in an outwardly extending rim-likeflange, said sections being arranged with said rim-like flanges inabutting contact and welded together along the edges of said rim-likeflanges, a partition conforming to the cross-sectional shape of theconnected sections and having a marginal flange secured to said sectionsfor dividing the interior of the sections into a combustion chamber anda burner chamber, and a burner pot supported by the partition andsuspended within the burner chamber.

10. A heating unit including, symmetrical panlike mating sections, eachhaving a wall portion ,and an integrally formed laterally extendingperimetrical flange terminating in an outwardly extending rim-likeflange, said sections being arranged with said rim-like flanges inabutting contact and welded together along the edges of said rim-likeflanges, a partition conforming to and an integrally formed laterallyextending perimetrical flange terminating in an outwardly extendingrim-like flange, said sections being arranged with said rim-like flangesin abutting contact and welded together along the edges of said rim-likeflanges, a partition conforming to the cross-sectional shape of theconnected sections and having a marginal flange secured to said sectionsfor dividing the interior of the sections into a combustion chamber anda burner chamber, a burner pot supported by the partition and suspendedwithin the burner chamber, the top lateral flange portions of saidsections having flanges extending from edges thereof, and a groovedframe receiving said flanged edges for forming a framed opening in theassembled sections, said flanged edges being welded to the groove ofsaid frame.

' RUSSELL MARTIN.

